Emulsified compositions for bleaching or dyeing the hair and method of bleaching or dyeing the hair using these emulsified compostions

ABSTRACT

It becomes possible to provide ammonia-containing hair bleaches or hairdyes which are highly safe and cause less hair damage, skin inflammation and irritation, and have no or reduced irritating odor of ammonia, and a method for bleaching or dyeing hair with the use of the hair bleaches or hairdyes by decreasing an average diameter of emulsified particles of emulsified compositions of ammonia-containing hair bleaches or hairdyes enough to reduce an irritating odor of ammonia.

TECHNICAL FIELD

The present invention is intended to provide an emulsified compositionfor an ammonia-containing hair bleach or hairdye, which is highly safeand causes less hair damage, skin inflammation and irritation, and hasno or reduced irritating odor of ammonia, and a method for bleaching ordyeing hair with the use of the emulsified composition.

BACKGROUND ART

Emulsified compositions of ammonia-containing oxidative hair bleaches orhairdyes are usually employed in two-pack type, however, there areone-pack and three-pack types other than two-pack type.

1. Oxidative Hair Bleaches and Hairdyes of Two-Pack Type

They are comprised of an agent containing alkaline chemicals only oralkaline chemicals and dyes as main components (hereinafter alsoreferred to as the first agent) and an agent containing an oxidant suchas hydrogen peroxide as a main component (hereinafter also referred toas the second agent). The two agents are mixed when used for treatinghair, and hair bleach or hairdye is conducted.

2. Oxidative Hairdyes of One-Pack Type

Hairdyes of one-pack type contain alkaline chemicals and dyes only. Theydo not contain oxidants, and natural oxidation is occurred in the air.

3. Oxidative Hair Bleaches or Hairdyes of Three-Pack Type

Powders of persulfate (oxidant), carbonate (alkaline chemical) or thelike are added to hair bleaches or hairdyes of two-pack type. In otherwords, an agent containing alkaline chemicals only or alkaline chemicalsand dyes, an agent containing hydrogen peroxide, and an agent containingpersulfate or the like are mixed just before the treatment and used.

Examples of alkaline chemicals contained in the aforementioned agents ofone-, two- or three-pack type include ammonia, ethanolamine, carbonate,etc., however, ethanolamine tends to leave its residues and has defectsthat it causes hair damage and skin irritation, and carbonate hasdefects that it is not very effective in improving the ability ofhydrogen peroxide to bleach or dye hair, and therefore, it cannot makehair color very bright. In contrast, ammonia is highly safe because itis not left on hair or scalp, and does not possibly cause hair damageand skin irritation and further, it has a property to improve theability of hydrogen peroxide to bleach or dye hair sufficiently,therefore, it is used most commonly. However, ammonia has a seriousdefect: it emits a characteristic irritating odor when treatments areconducted, and particularly when making hair much brighter, because ofthe necessity to blend a larger amount of ammonia, a strong irritatingodor is emitted and causes discomfort. When a blended amount of ammoniais simply reduced to overcome this defect, bleaching or dyeingperformance (hereinafter also referred to as basic performance) issignificantly decreased. Consequently, it is an important object toreduce an ammonia odor without decreasing the blended amount of ammoniawhen possible, while maintaining the basic performance.

As related art for attaining the above-mentioned object, for example,the following means <1> to <4> are suggested (FRAGRANCE JOURNAL 2001-8).

<1> Volatilization of Ammonia is Suppressed by Controlling its Form.

For example, volatilization of ammonia is suppressed by preparing an O/Wemulsified substance whose oil phase has a liquid crystal structure ofsurfactant/water, and confining ammonia into water of a liquid crystalphase of the substance, and both the reduction of ammonia and themaintenance of the basic performance are satisfied.

<2> Volatilization of Ammonia is Suppressed or Ammonia Odor is Reducedby Regulating pH.

For example, by making a buffer system of ammonia/ammonium bicarbonateor ammonium carbonate, ammonia odor is reduced in comparison to the caseof ammonia only, and the basic performance is maintained.

<3> An Amount of Ammonia is Reduced by Promoting Degradation of HydrogenPeroxide Significantly with the Use of a Catalyst, etc.

<4> An Alkaline Chemical Other than Ammonia Having no Irritating Odor isPenetrated Into Hair Efficiently.

As related art for attaining the above-mentioned object, the followingsare exemplified in addition to the aforementioned document.

The followings are compositions aimed at decrease of blended amount ofammonia.

A hair bleach composition of two-pack type comprising the first agentcontaining monoisopropanolamine and quarternary ammonium salt of fattyacid, and the second agent containing an oxidant, an oxidative hairdyecomposition of two-pack type comprising the first agent containingmonoisopropanolamine, quarternary ammonium salt of fatty acid and anoxidative dye, and the second agent containing an oxidant (JapaneseLaid-Open Patent Application No. 2001-122743), and a hairdye compositionof two-pack type comprising the first agent containing light isoparaffinand quarternary ammonium salt of fatty acid, and the second agentcontaining an oxidant (Japanese Laid-Open Patent Application No.2001-114657).

The followings are compositions aimed at substitution of ammonia.

A hairdye composition of two-pack type comprising the first agentcontaining light isoparaffin, and the second agent containing an oxidant(Japanese Laid-Open Patent Application No. 2001-2538), a hair bleachcomposition of two-pack type comprising the first agent containingmonoisopropanolamine and quarternary ammonium salt of fatty acid, andthe second agent containing an oxidant (Japanese Laid-Open PatentApplication No. 2001-122743), a hairdye composition wherein ammoniawater and isopropanolamine are blended with a particular weight ratio(Japanese Laid-Open Patent Application No. 2001-288053), a hairdyecomposition of two-pack type comprising the first agent containingmonoisopropanolamine and at least one kind of alkyl glucosides, and thesecond agent containing an oxidant (Japanese Laid-Open PatentApplication No. 2000-264822), a hairdye composition wherein ammoniawater and alkali metal carbonate are blended with a particular weightratio (Japanese Laid-Open Patent Application No. 2001-328926), and ahairdye composition wherein monoethanolamine and ammonia are blendedwith a particular weight ratio (Japanese Laid-Open Patent ApplicationNo. 10-45547).

The followings are exemplified as a substance which reduces anirritating odor of alkaline chemicals such as ammonia by masking, etc.

A hair cosmetic containing a fragrant component including cis-3-hexenol,a component selected from ammonia, monoethanolamine and aromaticalcohol-based penetration promoter (Japanese Laid-Open PatentApplication No. 2002-97122), and a hair treatment composition whichcomprises an alkaline chemical and a particular aromatic alcohol, and ismixed with an oxidant when used (Japanese Laid-Open Patent ApplicationNo. 11-29443).

DISCLOSURE OF THE INVENTION

The present inventor has conducted keen study to attain theabove-mentioned object in an emulsified composition for anammonia-containing oxidative hair bleach or hairdye and a method forbleaching or dyeing hair with the use of the emulsified composition withreduced irritating odor of ammonia. As a result, it has been found thatthe object, the reduction of irritating odor of ammonia, can be attainedin an emulsified composition for a hair bleach or hairdye which containsammonia as a main component by adopting means for decreasing a diameterof emulsified particles of the emulsified composition, which is themeans based on a technical thought completely different from that of theabove-mentioned prior art, and thus the present inventor has reached thepresent invention. In other words, the present inventor has found thatit is possible to reduce an irritating odor of ammonia significantly bydecreasing an average diameter of emulsified particles of anammonia-containing emulsified composition for dyeing or bleaching hair(hereinafter referred to as the first agent), which is usually about 50μm, preferably to 13 μm or less, and particularly to 10 μm or less, andthe present inventor has reached the present invention.

In the present invention, the above-mentioned expression “to reduce anirritating odor of ammonia significantly” means that though anirritating odor of the emulsified composition of the first agentmentioned above increases in proportion to the increase of blendedamount of ammonia, the decrease of an average diameter of emulsifiedparticles of the composition exhibits a significant effect for reducingthe irritating odor of ammonia in comparison with conventionally knownammonia-containing emulsified compositions when the same amount ofammonia is blended. Therefore, it becomes possible to reduce anirritating odor of ammonia in comparison with conventionally knownammonia-containing emulsified compositions when the same amount ofammonia is blended, and to use an amount of ammonia required to achievethe basic performance sufficiently while reducing its irritating odor.

Further, in the present invention, the reduction of an irritating odorof ammonia means that an irritating odor of ammonia is reduced to thedegree that persons who treat hair or persons who have their hairtreated do not smell an irritating odor of ammonia or slightly smell anammonia odor when the first agent of the present invention is used fordyeing or bleaching hair.

The present invention will be described more specifically withembodiments of the present invention, but the present invention is notlimited to the following embodiments.

A. The First Agent

As the first agent mentioned above used in the present invention,commercially available emulsified compositions of ammonia-containinghair bleaches or hairdyes are exemplified, and 28% ammonia water ofabout 3 to 15 wt %, usually about 6 to 8 wt %, is used in the emulsifiedcompositions. Further, the viscosity of the first agent and an oxidantmixed to the first agent is preferably adjusted to be about 10,000 to60,000 cps.

The first agents of hairdyes and hair bleaches of the present inventioncomprise, for example, at least the following (1) to (3).

-   (1) Ammonia-   (2) Surfactant-   (3) Other components of the emulsified composition (oleum, silicon,    water, etc.)    (1) Ammonia

In the first agent of the present invention, the effect for reducing anirritating odor of ammonia increases in proportion to the decrease of anaverage diameter of emulsified particles as mentioned above. Inaddition, in order to reduce an irritating odor of ammonia, it ispreferable to decrease an average diameter of emulsified particles inproportion to the increase in an amount of ammonia blended into thefirst agent. Accordingly, there arises the effect for reducing anirritating odor of ammonia sufficiently when an average diameter ofemulsified particles is decreased to about 13 μm, preferably to about 13μm to 5 nm, as aforementioned. The effect for reducing an irritatingodor of ammonia further increases when an average diameter of emulsifiedparticles is decreased preferably to 1 μm or less, for example, to about1 μm to 5 nm, more preferably to nm order. Therefore, the presentinvention makes it possible to solve both problems of an irritating odorof ammonia and securing of the basic performance such as bleaching ordyeing performance, compatibly, without adopting means for usingsubstitutes of ammonia, adding a masking agent for an irritating odor ofammonia, or adding a promoter of degradation of hydrogen peroxide, as inthe cases of prior art mentioned above.

The above-mentioned average diameter of emulsified particles can becontrolled by properly modifying at least one or two or more ofrequirements, for example, blended composition, blended order, means forstirring or degree of stirring of components which comprise the firstagent.

The above-mentioned average diameter of emulsified particles wasmeasured with a laser diffraction particle size analyzer SALD-2000(Shimadzu) and a submicron particle size analyzer N4S (Coulter) used inthe following examples.

The content of ammonia used in the first agent of the present inventionis 1 to 30 wt % of the emulsified composition in case where commerciallyavailable 28% ammonia aqueous solution is used. When the content ofammonia is less than 1 wt %, a sufficient effect for bleaching or dyeinghair is not obtained, and when the content of ammonia exceeds 30 wt %,possibility of skin irritation and strong irritating odor arise, andseverer discomfort is caused.

In addition to ammonia, other alkaline chemicals may be added to thefirst agent mentioned above. Examples of such alkaline chemicals includemonoethanolamine, diethanolamine, triethanolamine, morpholine, ammoniumcarbonate, ammonium hydrogen carbonate, sodium carbonate, sodiumhydrogen carbonate, guanidine hydrogen carbonate. One or more kinds ofthese alkaline chemicals can be used together with ammonia within arange of 0.1 to 10 wt % of the emulsified composition.

(2) Surfactant

As a surfactant used as an emulsifier of the composition of the firstagent, a nonionic surfactant is particularly preferable. It is possibleto blend one kind of, or a mixture of two or more kinds of nonionicsurfactants into the composition. The blended amount is not particularlylimited as long as it is a sufficient amount to obtain fine emulsifiedparticles, however, the blended amount is 0.1 to 50 wt %, preferably 0.1to 30 wt %, more preferably 0.1 to 10 wt % of the emulsifiedcomposition.

As to the amount of the nonionic surfactant used, when the amount isless than 0.1 wt %, sufficient emulsifying ability is not obtained, andit is not economical and may cause a negative influence on dyeingproperty to blend the amount of the nonionic surfactant exceeding 50 wt%.

As a surfactant, besides the nonionic surfactant, one or more kinds ofionic surfactants selected from anionic, cationic, and amphotericsurfactants can be blended alone, or together with a nonionicsurfactant. However, certain kinds and/or blended amounts of anionic,cationic, and amphoteric surfactants may cause a negative influence onthe effect for reducing an irritating odor of ammonia, therefore,anionic, cationic, and amphoteric surfactants can be used to the extentthat they do not cause a negative influence on the effect for reducingan irritating odor of ammonia, or that the effect for reducing anirritating odor of ammonia, which is the object of the presentinvention, can be attained. For example, in case where an ionicsurfactant is blended alone or together with a nonionic surfactant, ablended amount of the ionic surfactant is preferably 2 wt % or less,although it depends on the kinds of ionic surfactants used. Inparticular, blending of one or more kinds of ionic surfactants resultsin better emulsification, nicer touch of hair and easier removal ofcolor of hairdyes attached to scalps when treatments are conducted. Inthat case, the blended amount of the ionic surfactant mentioned above is2 wt % or less, preferably 1 wt % or less of the first agent. When theblended amount is 2% or more, there would be difficulty in reducing anirritating odor of ammonia when it is mixed with the second agent asmentioned above, even if diameters of emulsified particles aredecreased.

The nonionic surfactants used in the present invention are notparticularly limited and known nonionic surfactants conventionally usedfor hair bleaches and hairdyes can be widely used.

Examples of the nonionic surfactants include polyoxyethylene alkylethers such as polyoxyethylene isostearyl ether, polyoxyethyleneisocetyl ether, polyoxyethylene oleyl ether, polyoxyethylene oleylcetylether, polyoxyethylene stearyl ether, polyoxyethylene cetyl ether,polyoxyethylene cetostearyl ether, polyoxyethylene butyl ether,polyoxyethylene behenyl ether, polyoxyethylene myristyl ether,polyoxyethylene lauryl ether, polyoxyethylene tridecyl ether,polyoxyethylene hexyldecyl ether, polyoxyethylene octyldodecyl ether,polyoxyethylene decylpentadecyl ether, polyoxyethylene decyltetradecylether; polyoxy alkylphenyl ethers such as polyoxyethylene octylphenylether, polyoxyethylene dinonylphenyl ether, polyoxyethylene nonylphenylether; polyoxyethylene polyoxypropylene alkyl ethers such aspolyoxyethylene polyoxypropylene stearyl ether, polyoxyethylenepolyoxypropylene cetyl ether, polyoxyethylene polyoxypropylenedecyltetradecyl ether, polyoxyethylene polyoxypropylene butyl ether,polyoxyethylene polyoxypropylene lauryl ether; polyvalent alcohol fattyacid esters such as propylene glycol monostearate; glycerin fatty acidesters such as glyceryl monomyristate; polyglycerin fatty acid esterssuch as decaglyceryl monolaurate; sorbitan fatty acid esters such assorbitan monopalmitate; polyoxyethylene glycerin fatty acid esters suchas polyoxyethylene glyceril monostearate; polyoxyethylene sorbitan fattyacid esters such as polyoxyethylene sorbitan trioleate; polyoxyethylenesorbit fatty acid esters such as polyoxyethylene sorbit tetraoleate;polyoxyethylene glycol fatty acid esters such as polyoxyethylene glycolmonostearate; alkyl alkanol amides such as coconut fatty acid diethanolamide; polyoxyethylene hydrogenated castor oil; polyoxyethylene lanolin;polyoxyethylene cholesterol; polyoxyethylene phytosterol;polyoxyethylene cholestanol; polyoxyethylene phytostanol.

The ionic surfactants used in the present invention are not particularlylimited either, and anionic, cationic, and amphoteric surfactantsconventionally used for dyeing or bleaching hair can be properly used.

Examples of anionic surfactants include fatty acid soap, alkyl ethercarboxylate, fatty acid amide ether carboxylate, acyl lactate, N-acylglutamate, N-acyl alanate, N-acyl sarcosinate, N-acyl-ω-amino-acid salt,alkane sulfonate, α-olefin sulfonate, α-sulfofatty acid methyl estersalt, acyl isethionate, alkyl glycidyl ether sulfonate, alkylsulfosuccinate, alkyl sulfoacetate, alkyl benzene sulfonate, alkylnaphthalene sulfonate, N-acyl methyl taurate, formalin-condensedsulfonate, alkyl sulfate, polyoxyethylene alkyl ether sulfate, alkylaryl ether sulfate, fatty acid alkanol amide sulfate, fatty acidmonoglyceride sulfate, alkyl phosphate, polyoxyethylene alkyl etherphosphate, alkyl aryl ether phosphate, and fatty acid amide etherphosphate.

Examples of cationic surfactants include quaternary ammonium salts suchas stearyl chloride trimethyl ammonium, cetyl chloride trimethylammonium, alkyl chloride trimethyl ammonium, distearyl chloride dimethylammonium; fatty acid amide amine salt; alkyl trialkylene glycol ammoniumsalt; benzalkonium salt; benzethonium salt; pyridium salt; imidazoliniumsalt.

Examples of amphoteric surfactants include those of glycine type,aminopropionic acid type, alkylbetaine type, alkyl amide betaine type,imidazoline type, amine oxide type, sulfobetaine type, sulfonic acidtype, sulfuric acid type, and phosphoric acid type.

As the forms of emulsified substances of the first agent mentionedabove, O/W emulsions or W/O emulsions are exemplified, however, combinedemulsions in which O/W emulsions or W/O emulsions are dispersed in waterare more preferable.

(3) Other Components of the Emulsified Composition (Oleum, Silicon,Water, etc.)

An oleum can be added to the first agent of the present invention.Examples of such oleum include higher alcohols such as behenyl alcohol,stearyl alcohol, cetostearyl alcohol, cetanol, lauryl alcohol; oils suchas avocado oil, olive oil, macadamia nut oil, castor oil; hydrocarbonssuch as liquid paraffin, squalene, microcrystalline wax; higher fattyacids such as lauric acid, myristic acid, stearic acid; esters such asisopropyl myristate, isostearyl isostearate, myristyl lactate.

It is possible to blend one kind of, or a mixture of two or more kindsof the olea mentioned above, and blended amount is 0.1 to 30 wt %,preferably 0.5 to 20 wt % of the emulsified composition.

An oxidization dye is blended into compositions of the first agent fordyeing hair of the present invention. Specific examples of the dyeinclude phenylenediamines, aminophenols, toluilenediamines,aminonitrophenols, diphenylamines, diaminodiphenylamines,N-phenylphenylenediamines, aminopyridines and salts thereof. In additionto them, couplers such as resorcin, pyrogallol, catechol,metaminophenol, metaphenylenediamine, can be blended. Further,substances listed in “The Japanese Standards for Quasi-Drug Ingredients”(The Yakuji Nippo Limited, issued June, 1991) are also specific examplesof the oxidization dye and the coupler, and can be used. It is possibleto use one kind of, or a combination of two or more kinds of theseoxidization dyes and couplers respectively, and blended amount is notparticularly limited but is preferably 0.01 to 20 wt %, particularlypreferably 0.1 to 10 wt % of the emulsified composition.

Besides the components mentioned above, other optional componentsusually used in the cosmetic field can be blended into the first agentof the present invention to the extent that they do not interfere withthe effect of the present invention. Examples of these optionalcomponents include moisturizers such as glycerin, propyleneglycol,polyethyleneglycol; stabilizers such as sulfite, ascorbic acid,thioglycollate, cysteine, edetate; conditioners such as cationizedcellulose, cationized guar gum, cationized polymer, cationized resin;silicones such as methyl polysiloxane, polyether modified silicone,amino modified silicone; hair protectants such as protein, polypeptide,amino acid; thickeners such as carboxyethyl cellulose, xanthan gum;UV-radiation absorbents; preservatives; pearl brighteners; penetrants;humectants; pilatory agents; colorants; flavors.

The forms of the first agent of the present invention are notparticularly limited, and as long as the agent is an emulsifiedcomposition, various forms such as cream, emulsion, aerosol foam, mist,spray, can be employed.

The first agent of the present invention can be produced by an ordinarymethod, however, regarding the mixing and stirring of each component,each component is gradually added and the resulting mixture is stirredenough to be a minute emulsified substance.

B. The Second Agent

The first agent of the present invention is mixed with the second agentcontaining an oxidant such as hydrogen peroxide, and used to treat hair.This mixing of the first and the second agents is usually conducted justbefore the treatment.

Examples of the oxidant used as the second agent include hydrogenperoxide and urea peroxide, and the concentration in use depends on thebrightness of hair required. For example, hydrogen peroxide is usedusually at a concentration of about 0.5 to 15 wt %, more preferably,about 0.5 to 12 wt %. Further, stabilizers such as phenacetin andedetate, surfactants, oils and fats, hydrocarbons, higher alcohols,higher fatty acids, esters, conditioners, hair protectants, thickeners,acids, pH regulators, flavors, colorants, etc., can be blended properlyinto the second agent, in addition to oxidants.

The forms of the second agent are not particularly limited, and forexample, forms such as liquid, emulsion, cream, gel, aerosol foam, mist,spray, can be employed, but it is preferable that the form of the secondagent is the same as that of the first agent.

In case where the second agent is used as an emulsified composition in asame manner as in the case where the first agent is used, a nonionicsurfactant is preferable as a surfactant, and from the viewpoint of thereduction of an irritating odor of ammonia, as in the case of the firstagent, the effect becomes prominent in proportion to the decrease of anaverage diameter of emulsified particles. In addition, it is preferablethat the first and the second agents mentioned above have a same degreeof physical properties, in particular, a same degree of viscosity. It isparticularly preferable that the first and the second agents have thesame form, and a same degree of viscosity wherein dripping is preventedon hair.

The use of the first and the second agents having a same degree ofviscosity provides not only easier mixing of these agents, but alsocomplete solution to problems such as dripping of emulsifiedcompositions or difficulty in treatment due to the hardness of thecompositions, because the viscosity is constant even though these agentsare mixed with an optional combination and/or an optional ratio.Therefore, persons who treat hair can mix the first and the secondagents easily at a ratio of their own choice, and can change thebrightness and color tone of hair freely. For example, by increasing themixing ratio of the second agent to enhance oxidizing ability, strongerbleach is conducted. In case of hair bleach, original hair color isremoved more strongly, and in case of hairdye, it becomes possible todye hair a brighter color tone.

As the first and the second agents having substantially the sameviscosity which prevents dripping on hair, a creamy agent of about10,000 to 60,000 cps is preferable, and of about 20,000 to 45,000 cps ismore preferable. In the present invention, “the viscosities of the firstand the second agents are substantially the same” does not mean that theviscosities of both agents are exactly the same. The viscosities of thefirst and the second agents are regarded as substantially the same ifpersons who treat hair can mix the first and the second agents easily ata ratio of their own choice, and can change the brightness and colortone of hair freely, as mentioned above, even though there is adifference in the viscosities of the first and the second agents.

In the aforementioned embodiments of the present invention, hairbleaches and hairdyes are described with reference to two-pack typewhich uses the first and the second agents mentioned above, however,even in case of one- or three-pack type, in case where anammonia-containing emulsified composition is used, an ammonia odor canbe reduced by decreasing diameters of emulsified particles of theemulsified composition.

Also in three-pack type, in particular, when an agent containing anoxidant is an emulsified composition, the effect for reducing an ammoniaodor can be increased in proportion to the decrease of diameters ofemulsified particles of the agent.

It is possible to bleach or dye hair with the use of theammonia-containing emulsified composition mentioned above. In one-packtype, an amount of the composition used for one treatment is put into acup and used for the treatment by an ordinary method. In two- andthree-pack types, equal amounts of the first agent containing ammoniaused for one treatment and the second agent containing an oxidant areput into a cup, and a powder composition, the third agent, is added inthree-pack type, and the mixture is stirred with a brush, and used forthe treatment by an ordinary method.

As for a treating method which further increases the effect of thepresent invention, in case of two- and three-pack types, it ispreferable to make the first agent containing ammonia and the secondagent containing an oxidant have a same degree of physical properties,particularly viscosity, and to use them for treatments. Asaforementioned, the use of the first and the second agents having a samedegree of viscosity can provide not only an easy and uniform mixing ofthese agents, but also an optional setting of a mixing ratio of thefirst and the second agent at the time of treatment, and as a result, anoptional color tone can be obtained. In this case, it is preferable thatthe viscosity of the emulsified composition is 10,000 to 60,000 cps.

BEST MODE OF CARRYING OUT THE INVENTION

The present invention will be described more specifically with bestmodes of carrying out the invention, but the present invention is notlimited to these modes. In the followings, average diameters ofemulsified particles of the first agents prepared in examples weremeasured, the first agents were mixed with the second agents inreference examples, and evaluation was conducted according to theevaluation method mentioned below. The results are shown in Table 3.

Evaluation Method

(1) Measurement of Average Diameters of Emulsified Particles

Emulsified hairdye compositions were properly diluted with purifiedwater, and the average particle diameters of the diluted solutions weremeasuredwith a laser diffraction particle size analyzer SALD-2000(Shimadzu) and a submicron particle size analyzer N4S (Coulter).

(2) Ammonia Odor Test

10 g of emulsified hairdye composition and 10 g of the second agent wereput into a cup, stirred with a brush, and used as a sample. In eachexample, 20 monitors were divided into 5 groups of 4 persons, and freshsamples were prepared for each group. Each monitor further stirred thesample with a brush one or two times on evaluation, and smelled thesample. Sensory evaluation was conducted according to the followingstandards.

-   ⊚: indicates that almost no irritating odor is sensed.-   ◯: indicates that it has a faint irritating odor.-   Δ: indicates that it has a considerable irritating odor.-   X: indicates that it has an overpowering irritating odor.    (3) Hairdye Test

Emulsified hairdye composition and the second agent were put into a cupat a ratio of 1:1, and the mixture was stirred with a brush and appliedto a tuft of human black hair. The tuft of human black hair was left for30 minutes at room temperature, and then shampooed, rinsed and dried.After hairdye was completed, each tuft of hair was compared bymacroscopic evaluation.

EXAMPLES 1˜2

In each example, blended components were arranged to be 800 g in totalaccording to the blended amounts described in Table 1 shown below, a1-liter glass beaker was used, and the blended components were stirredmanually with two glass rods 8 mm in diameter.

Specifically, components other than paraphenylenediamine, resorcin,sodium sulfite, 28% ammonia water, purified water, were melted by heatat 75° C. (oily components). Paraphenylenediamine, resorcin, sulfite,purified water (aqueous components) were melted by heat at 75° C. whilebeing stirred moderately, and this mixture was gradually added to theoily components, which was being stirred as fast as possible (about 1 to2 rotation/sec). The resulting mixture was stirred in a similar mannerand cooling of the mixture was started. The mixture was continued to bestirred as fast as possible (the speed was reduced to about 1rotation/sec) even when the mixture was cooled to about 50° C. and theviscosity started to increase, and then, the mixture was cooled to 30°C. Next, 28% ammonia water was added to the mixture, and the stirringwas continued to the resulting mixture in a similar manner, thus acreamy emulsified composition (the first agent) was arranged. It tookabout 15 minutes to complete the arrangement of the creamy emulsifiedcomposition (the first agent) from when the mixing of the oilycomponents and the aqueous components was started.

Example 3 was conducted in a manner similar to that of Examples 1˜2,however, the speed of stirring for mixing the oily components and theaqueous components was consistently slower (0.5 to 1 rotation/sec).

The obtained average diameters of emulsified particles of Examples 1˜3are indicated in Table 3 shown below. TABLE 1 Blended components Example1 Example 2 Example 3 Cetanol 4.0 4.0 6.0 Liquid paraffin 8.0 8.0 6.0Polyoxyethylene stearyl ether 6.0 5.0 6.0 Stearyl chloride trimethyl —1.0 — ammonium (70%) Polyethylene glycol 5.0 5.0 5.0Paraphenylenediamine 0.5 0.5 0.5 Resorcin 0.5 0.5 0.5 Sodium sulfite 0.50.5 0.5 28% ammonia water 8.0 8.0 8.0 Purified water Amount that makes100 wt % in totalThe values in Table 1 shown above indicate wt %.

REFERENCE EXAMPLE 1 Method for Preparing the Second Agent

An aqueous solution of the second agent was prepared by adding purifiedwater to 17 wt % of 35% hydrogen peroxide solution to make 100 wt % ofthe resulting solution. Reference Examples 2˜3 (Method for preparing thesecond agent)

According to the blended amounts described in Table 2 shown below,components other than 35% hydrogen peroxide solution and purified waterwere melted by heat at 75° C., and purified water, heated to 75° C., wasgradually added to the mixture of the components while being stirred,and the stirring was continued to the resulting mixture. When themixture was cooled to 30° C., another 35% hydrogen peroxide solution wasadded and a creamy emulsified composition was obtained. The averageparticle diameter of the emulsified composition obtained in ReferenceExample 2 was 202 nm, and that of the emulsified composition obtained inReference Example 3 was 4.086 μm. TABLE 2 Reference Example 2 ReferenceExample 3 Cetanol 5.0 5.0 Liquid paraffin 10.0 5.0 Polyoxyethylene 6.04.0 stearyl ether Polyethylene glycol 5.0 5.0 35% hydrogen peroxide 17.017.0 solution Purified water Amount that makes 100 wt % in totalThe values in Table 2 shown above indicate wt %.

TABLE 3 Average diameters of emulsified Ammonia odor test particles (thefirst agents) ⊚ ◯ Δ X Example 1 392 nm 17 3 Example 1A 392 nm 20 Example1B 392 nm 18 2 Example 2 288 nm 11 9 Example 3 7.865 μm 5 14 1

The values in the ammonia odor test in Table 3 shown above indicate thenumber of test subjects. Further, in the ammonia odor test, the secondagent of Reference Example 1 was used in Examples 1˜3, and the secondagent of Reference Example 2 was used in Example 1A, and the secondagent of Reference Example 3 was used in Example 1B. As a result of thehairdye test, tufts of hair were dyed in the same color tone in allExamples in Table 3.

EXAMPLE 4 Method for Dyeing Hair

60 g of the emulsified composition obtained in Example 1 was put into acup, and 60 g of the emulsified composition obtained in ReferenceExample 2 was added to the aforementioned composition. The resultingmixture was stirred with a brush, and applied to dye black hair brown inaccordance with an ordinary method. In the process of hairdye, there waslittle ammonia odor, and as a result of the hairdye test, tufts of hairwere dyed in the same color tone as in other Examples.

INDUSTRIAL APPLICABILITY

The present invention makes it possible to provide an ammonia-containingoxidative hair bleach or hairdye, wherein an irritating odor of ammoniacan be reduced to the extent nearly imperceptible when an emulsifiedcomposition for an ammonia-containinghairbleach orhairdye andan agentcontaining an oxidant such as hydrogen peroxide are mixed and used fortreating hair, and a method for bleaching or dyeing hair with the use ofthe hair bleach or hairdye.

1. An emulsified composition for an ammonia-containing hair bleach orhairdye, wherein an average diameter of emulsified particles of saidcomposition is small enough to reduce an irritating odor of ammonia. 2.The emulsified composition for an ammonia-containing hair bleach orhairdye according to claim 1, wherein the average diameter of emulsifiedparticles of said composition is 10 μm or less.
 3. The emulsifiedcomposition for an ammonia-containing hair bleach or hairdye accordingto claim 1, comprising a nonionic surfactant of 0.1 to 50 wt %.
 4. Theemulsified composition for an ammonia-containing hair bleach or hairdyeaccording to claim 3, comprising one or more kinds of ionic surfactantsof 2 wt % or less, selected from an anionic surfactant, a cationicsurfactant, and an amphoteric surfactant.
 5. A hair bleach or hairdyewhich comprises at least the emulsified composition for a hair bleach orhairdye according to claim 1, and an oxidant.
 6. The hair bleach orhairdye according to claim 5, wherein the emulsified composition for anammonia-containing hair bleach or hairdye and a composition containingthe oxidant has a same viscosity.
 7. The hair bleach or hairdyeaccording to, claim 5, wherein the viscosities of the emulsifiedcomposition for an ammonia-containing hair bleach or hairdye and thecomposition containing the oxidant are 10,000 to 60,000 cps.
 8. A methodfor bleaching or dyeing hair which uses the hair bleach or hairdyeaccording to claim 1.